Slán has many meanings, one of which is "bye". sigmacharding and NiallT are correct that it also means "safe" (save) and "health", respectively. It would be helpful if the feedback to a question would elaborate on multiple translations of a word rather than indicating an incorrect answer when a responder has chosen an alternative translation.

If you're using the web, the accented characters are displayed below the text box - click on them to add the accents, or just enable accented characters on your keyboard - it's a software issue, not a hardware issue.

If you're using an app on a phone, just long-press on a vowel to get the option of an accent.

Accents aren't optional in Irish. If you're not using them, you're not spelling the words correctly.

God be with you..Huh I never would've figured that on my own the english language has neat ways to make people feel happy and welcome but were here for Irish so I should be talking about Irish so..Slan!!

If you already now some Irish, you don't have to start at the beginning - you can "test" out at a series of checkpoints so that you can demonstrate that you don't need to go through the early material.